import axios from 'axios'
import {
  Notification,
  MessageBox,
  Message
} from 'element-ui'
import store from '@/store'
import {
  getToken
} from '@/utils/auth'
import errorCode from '@/utils/errorCode'

axios.defaults.headers['Content-Type'] = 'application/json;charset=utf-8'
// 创建axios实例
const service = axios.create({
  // axios中请求配置有baseURL选项，表示请求URL公共部分
  baseURL: process.env.VUE_APP_BASE_API,
  responseType: 'blob',
  // 超时
  timeout: 60000
})
// request拦截器
service.interceptors.request.use(config => {
  // 是否需要设置 token
  const isToken = (config.headers || {}).isToken === false
  if (getToken() && !isToken) {
    config.headers['Authorization'] = 'Bearer ' + getToken() // 让每个请求携带自定义token 请根据实际情况自行修改
  }
  // get请求映射params参数
  if (config.method === 'get' && config.params) {
    let url = config.url + '?';
    for (const propName of Object.keys(config.params)) {
      const value = config.params[propName];
      var part = encodeURIComponent(propName) + "=";
      if (value !== null && typeof(value) !== "undefined") {
        if (typeof value === 'object') {
          for (const key of Object.keys(value)) {
            let params = propName + '[' + key + ']';
            var subPart = encodeURIComponent(params) + "=";
            url += subPart + encodeURIComponent(value[key]) + "&";
          }
        } else {
          url += part + encodeURIComponent(value) + "&";
        }
      }
    }
    url = url.slice(0, -1);
    config.params = {};
    config.url = url;
  }
  return config
}, error => {
  console.log(error)
  Promise.reject(error)
})

function getObjectClassName(obj) {
  if (obj && obj.constructor && obj.constructor.toString) {
    var arr = obj.constructor.toString().match(/function\s*(\w+)/);
    if (arr && arr.length == 2) {
      return arr[1];
    }
  }
  return undefined;
}

// 响应拦截器
service.interceptors.response.use(res => {
    let type = getObjectClassName(res.data);
    if ("Blob" === type) {
      if (res.headers["content-type"].indexOf("application/json") >= 0) {
        // convert to json
        const reader = new FileReader();
        reader.readAsText(res.data, 'utf-8');
        reader.onload = function(e) {
        const readerres = reader.result;
        const parseObj = JSON.parse(readerres);
        const code = parseObj.code || 200;
          // 获取错误信息
          const msg = errorCode[code] || parseObj.mag || errorCode['default']
          if (code === 401) {
            MessageBox.confirm('登录状态已过期，您可以继续留在该页面，或者重新登录', '系统提示', {
              confirmButtonText: '重新登录',
              cancelButtonText: '取消',
              type: 'warning'
            }).then(() => {
              store.dispatch('LogOut').then(() => {
                location.href = '/index';
              })
            })
          } else if (code === 500) {
            Message({
              message: msg,
              type: 'error'
            })
            return Promise.reject(new Error(msg))
          } else if (code !== 200) {
            Notification.error({
              title: msg
            })
            return Promise.reject('error')
          }
        }
      } else {
        if (res.data.size <= 0) {
          Message({
            message: '文件导出失败，内容为空或目标文件丢失',
            type: 'error',
          })
        }
        return res;
      }
    }

  },
  error => {
    console.log('err' + error)
    let {
      message
    } = error;
    if (message == "Network Error") {
      message = "后端接口连接异常";
    } else if (message.includes("timeout")) {
      message = "系统接口请求超时";
    } else if (message.includes("Request failed with status code")) {
      message = "系统接口" + message.substr(message.length - 3) + "异常";
    }
    Message({
      message: message,
      type: 'error',
      duration: 5 * 1000
    })
    return Promise.reject(error)
  }
)

export default service
